Porygon is a Normal-type Pokemon, and one of the hardest Pokemon to evolve in Pokemon GO. Trainers will need an Upgrade and 25 Candy to evolve Porygon to Porygon2, and then a Sinnoh Stone and 100 Candy to evolve Porygon2 to Porygon-Z. Currently, Porygon is the only Pokemon that requires an Upgrade to evolve, but there’s a chance Niantic will add more Pokemon that need an Upgrade later.
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